package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.lang.reflect.Field;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.不符合返回错误信息
            return Result.fail("手机号格式错误");
        }
        //3.符合生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4.保存代码到redis中
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone , code , LOGIN_CODE_TTL , TimeUnit.MINUTES);
        //4.保存验证码到session
        //session.setAttribute("code", code);
        //5.发送验证码
        log.debug("发送短信验证码成功,验证码:{}", code);
        //6.返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.不符合返回错误信息
            return Result.fail("手机号格式错误");
        }
        //2.校验验证码
        //Object cacheCode = session.getAttribute("code");
        //String code = loginForm.getCode();

        //从redis中获获取验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if (cacheCode == null || !cacheCode.equals(code)){
            //3.不一致，报错
            return Result.fail("验证码错误");
        }
        //4.一致，根据手机号查询用户
        User user = query().eq("phone", phone).one();
        //5.判断判断用户是否存在
        if (user == null) {
            //6.不存在，创建新用户并保存
            user = createUserWithPhone(phone);
        }
        //7.保存用户信息到session中
        // session不需要加入登录凭证
        //session.setAttribute("user", BeanUtil.copyProperties(user , UserDTO.class));

        //7.保存用户到redis中
        //7.1将user对象转化为Hash存储
        String token = UUID.randomUUID().toString();
        //7.2将user对象转化为Hash存储
        UserDTO userDTO = BeanUtil.copyProperties(user , UserDTO.class);
        HashMap<Object, Object> userMap = new HashMap<>();
        userMap.put("id", userDTO.getId().toString());
        userMap.put("nickName", userDTO.getNickName());
        userMap.put("icon", userDTO.getIcon());
        //7.3存储
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey , userMap);
        //7.4设置token有效期
        stringRedisTemplate.expire(tokenKey , LOGIN_USER_TTL , TimeUnit.MINUTES);

        //8.返回token
        return Result.ok(token);
    }

    @Override
    public Result sign() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.写入redis setbit key offset 1
        stringRedisTemplate.opsForValue().setBit(key , dayOfMonth - 1 , true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //1.获取本月截止今天为止的签到记录//1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.获取本月截止到今天的所有签到记录
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create().get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if(result == null||result.isEmpty()){
            return Result.ok(0);
        }
        Long num = result.get(0);
        if(num == null || num == 0){
            return Result.ok(0);
        }
        //6.循环遍历
        int count = 0;

        while (true){
            if ((num & 1) == 0){
               break;
            }else {
                count ++;
            }
            num >>>= 1;
        }
        //7.让这个数字与1做与运算 得到最后一个bit位
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        //创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        save(user);

        //保存用户
        save(user);
        return user;
    }

}
